cap code snippets

deploy.rb

# =========================
# For Bundler
# Cap will run "bundle --deploy" on the production server
# every time when you deploy
# ==========================
require 'bundler/capistrano'

set :application, "wechat_bot"

# ==========================
# Single server 
# ==========================
server "192.81.133.63", :app, :web, :db, :primary => true


# ==========================
# Set app path
# ==========================
set :application, "weixin"
set :user, "deploy"
set :deploy_to, "/home/#{user}/app/#{application}"


# ==========================
# Use rbenv in cap
# ==========================
set :default_environment, {
  'RBENV_ROOT' => "/home/#{user}/.rbenv/bin/rbenv",
  'PATH' => "/home/#{user}/.rbenv/shims:/home/#{user}/.rbenv/bin:/usr/local/bin:/usr/bin:/bin:/opt/bin:$PATH"
}


# ==========================
# Git configuration
# ==========================
set :scm, :git
set :repository,  "git@github.com:vincent178/wechat.git"
set :branch, "master"

# ssh_options[:keys] = [File.join(ENV["HOME"], ".ssh", "id_rsa")]
# ssh_options[:config] = false

# use ssh key to do a password-less login 
ssh_options[:forward_agent] = true

default_run_options[:pty] = true
# Reuse the repo instead of brand new git clone each time
set :depoly_via, :remote_cache

set :use_sudo, false

# ==========================
# For Migrations
# "cap deploy:migrate" only run migrations
# "cap deploy:migrations" run deploy and migrations
# it won't hurt after every deploy
# ==========================
# after 'deploy:update_code', 'deploy:migrate'


set :keep_release, 5
after "deploy:restart", "deploy:cleanup"

# ==========================
# Unicorn settings
# ==========================
set :unicorn_config, "#{current_path}/config/unicorn.rb"
set :unicorn_pid, "#{current_path}/tmp/pids/unicorn.pid"

namespace :nginx do

  task :link, except: { no_release: true } do
    sudo "ln -nfs #{current_path}/config/nginx.conf /etc/nginx/nginx.conf "
  end

end

namespace :deploy do

  task :start, :except => { no_release: true } do
    run "cd #{current_path} && RAILS_ENV=production bundle exec unicorn_rails -c #{unicorn_config} -D"
  end

  task :stop, except: { no_release: true } do
    run "if [ -f #{unicorn_pid} ]; then kill -QUIT `cat #{unicorn_pid}`; fi"
  end

  task :restart, except: { no_release: true } do
    run "if [ -f #{unicorn_pid} ]; then kill -s USR2 `cat #{unicorn_pid}`; fi"
  end

  task :clear_log, except: { no_release: true } do
    run "cd #{shared_path}/log && echo '' > production.log"
  end

  task :setup_config do
    run "mkdir -p #{shared_path}/config"
    sudo "ln -nfs #{current_path}/config/nginx.conf /etc/nginx/nginx.conf "
    put File.read("config/database.example.yml"), "#{shared_path}/config/database.yml"
    puts "Now edit the config files in #{shared_path}"
  end
  after "deploy:setup", "deploy:setup_config"

  task :symlink_config do
    run "ln -nfs #{shared_path}/config/database.yml #{release_path}/config/database.yml"
  end
  after "deploy:finalize_update", "deploy:symlink_config"

  
  desc "Make sure local git is in sync with remote."
  task :check_revision do
    unless `git rev-parse HEAD` == `git rev-parse origin/master`
      puts "WARNING: HEAD is not the same as origin/master"
      puts "Run `git push ` to sync changes."
      exit
    end
  end
  before "deploy", "deploy:check_revision"
end